[Solved]How to set the viewer for TIFF files?

I am using Opera 32 and I can't see anything in Preferences that allows me to establish what program is utilized for what file type. When I click on a TIFF file, Paint is used. However, I have another viewer that I want to use. I have that other viewer set as the default program in Windows. But it seem like Opera has its own set of preferences? Very frustrating! Any help would be appreciated, thanks.

Thanks for responding. I did set the Windows defaults and when I open the file from Windows Explorer, the viewer I want is used. However, Opera seems to have it's own preferences and utilizes Paint. In searching the Web I feel like I saw that in older versions of Opera you could change the programs associated with files but I'm not seeing any way of doing this in version 33. I think Opera should use the Windows defaults but...it's not.